Struktur von Coleon E, einem neuen diterpenoiden Methylenchino aus der<i>Coleus barbatus</i>-Gruppe (<i>Labiatae</i>)
作者:P. Rüedi、C. H. Eugster
DOI:10.1002/hlca.19720550619
日期:1972.7.10
quinone methide, Coleon E, C20H22O5. Degradations and spectra (including 13C-NMR.) have been interpreted in terms of the unusual irregular diterpenoid structure 1. Its fully conjugated unsaturated system extends over 3 rings. The CH3-group at C(3) and n-propyl side chain at C(13) instead of the usual isopropyl group are regarded as arising by modification of an abietane precursor. Coleon E, after reduction
我们从锦鸡儿(本底)叶子上的腺体中分离出来。Agnew C. Kilimandschari(Gürcke)Agnew和C.种PRO Bally No. 10431,全部来自东非,新的,非常不稳定的,深红色醌甲基化物,Coleon E,C 20 H 22 O 5。降解和光谱(包括13 C-NMR。)已根据异常的不规则二萜结构1进行了解释。其完全共轭的不饱和体系延伸超过3个环。C(3)处的CH 3-基和C(13)处的正丙基侧链,而不是通常的异丙基,被认为是由于对枞豆烷前体的改性而产生的。在还原和甲基化后,发现Coleon E发生骨架重排,导致烷基侧链与酚OH基团正式交换。